家庭记账本app进度之android中AlertDialog的相关应用以及对日期时间的相关操作（应用alertdialog使用的谈话框）

android:calendarTextColor ： 日历列表的文本的颜色
android:calendarViewShown：是否显示日历视图
android:datePickerMode：组件外观，可选值:spinner，calendar 前者效果如下，默认效果是后者 
android:dayOfWeekBackground：顶部星期几的背景颜色
android:dayOfWeekTextAppearance：顶部星期几的文字颜色
android:endYear：去年(内容)比如2010
android:firstDayOfWeek：设置日历列表以星期几开头
android:headerBackground：整个头部的背景颜色
android:headerDayOfMonthTextAppearance：头部日期字体的颜色
android:headerMonthTextAppearance：头部月份的字体颜色
android:headerYearTextAppearance：头部年的字体颜色
android:maxDate：最大日期显示在这个日历视图mm / dd / yyyy格式
android:minDate：最小日期显示在这个日历视图mm / dd / yyyy格式
android:spinnersShown：是否显示spinner
android:startYear：设置第一年(内容)，比如19940年
android:yearListItemTextAppearance：列表的文本出现在列表中。
android:yearListSelectorColor：年列表选择的颜色

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    tools:context=".MainActivity">

    <LinearLayout
        android:id="@+id/ll_date"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="选择日期:"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tv_date"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#3243"
            android:padding="8dp"
            android:textSize="18sp" />

    </LinearLayout>

    <LinearLayout
        android:id="@+id/ll_time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="选择时间:"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/tv_time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#3243"
            android:padding="8dp"
            android:textSize="18sp" />

    </LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="vertical">

    <DatePicker
        android:id="@+id/datePicker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:calendarViewShown="false"
        android:endYear="2027"
        android:startYear="2007" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical">

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></TimePicker>

</LinearLayout>

package com.example.myapplicationhome;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.TimePicker;
import androidx.appcompat.app.AppCompatActivity;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, DatePicker.OnDateChangedListener, TimePicker.OnTimeChangedListener {
    private Context context;
    private LinearLayout llDate, llTime;
    private TextView tvDate, tvTime;
    private int year, month, day, hour, minute;
    //在TextView上显示的字符
    private StringBuffer date, time;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = this;
        date = new StringBuffer();
        time = new StringBuffer();
        initView();
        initDateTime();
    }

    /**
     * 初始化控件
     */
    private void initView() {

        llDate = (LinearLayout) findViewById(R.id.ll_date);
        tvDate = (TextView) findViewById(R.id.tv_date);
        llTime = (LinearLayout) findViewById(R.id.ll_time);
        tvTime = (TextView) findViewById(R.id.tv_time);
        llDate.setOnClickListener(this);
        llTime.setOnClickListener(this);
    }

    /**
     * 获取当前的日期和时间
     */
    private void initDateTime() {
        Calendar calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR);
        month = calendar.get(Calendar.MONTH)+1;
        day = calendar.get(Calendar.DAY_OF_MONTH);
        hour = calendar.get(Calendar.HOUR);
        minute = calendar.get(Calendar.MINUTE);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.ll_date:
                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (date.length() > 0) { //清除上次记录的日期
                            date.delete(0, date.length());
                        }
                        month+=1;
                        tvDate.setText(date.append(String.valueOf(year)).append("年").append(String.valueOf(month)).append("月").append(day).append("日"));
                        dialog.dismiss();//取消对话框的作用
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                final AlertDialog dialog = builder.create();//创建对话框
                View dialogView = View.inflate(context, R.layout.dialog_date, null);
                /*这个方法可以得到view,但是对view中设置居中等什么属性都是无效的，还有就是设置的宽度也是无效的，默认只能是wrap*/
                final DatePicker datePicker = (DatePicker) dialogView.findViewById(R.id.datePicker);

                dialog.setTitle("设置日期");
                dialog.setView(dialogView);//可以通过自定义一个View，设计成自己想要的不同的dialog，(会话)
                dialog.show();//显示对话框
                //初始化日期监听事件
                datePicker.init(year, month-1 , day, this);
                break;
            case R.id.ll_time:
                AlertDialog.Builder builder2 = new AlertDialog.Builder(context);
                builder2.setPositiveButton("设置", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (time.length() > 0) { //清除上次记录的日期
                            time.delete(0, time.length());
                        }
                        tvTime.setText(time.append(String.valueOf(hour)).append("时").append(String.valueOf(minute)).append("分"));
                        dialog.dismiss();
                    }
                });
                builder2.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                AlertDialog dialog2 = builder2.create();
                View dialogView2 = View.inflate(context, R.layout.dialog_time, null);

                TimePicker timePicker = (TimePicker) dialogView2.findViewById(R.id.timePicker);
                timePicker.setCurrentHour(hour);
                timePicker.setCurrentMinute(minute);
                timePicker.setIs24HourView(true); //设置24小时制

                timePicker.setOnTimeChangedListener(this);
                dialog2.setTitle("设置时间");
                dialog2.setView(dialogView2);
                dialog2.show();
                break;
        }
    }


    /**
     * 日期改变的监听事件
     *
     * @param view
     * @param year
     * @param monthOfYear
     * @param dayOfMonth
     */
    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        this.year = year;
        this.month = monthOfYear;
        this.day = dayOfMonth;
    }

    /**
     * 时间改变的监听事件
     *
     * @param view
     * @param hourOfDay
     * @param minute
     */
    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        this.hour = hourOfDay;
        this.minute = minute;
    }
}